Boring machine



March 12, 1940. o. NlLsoN v 2,193,204

BORING MACHINE Filed March 26, 1938 Olof 41/3017 Patented Mar. 12, 1940UNl-TED STATES PATENT OFFIQE 2,193,204 BORING MACHINE 0lof Nilson, SaltLake City, Utah. Application March 26, 1938, Serial. No. 198,256 l I 3Claims. (01. 77-62) This invention relates to improvements inportablemanually operated wood boring devices for morticing anddoweling. The object of the improvements is, first, the elimination ofsuperfluous mechanical complexities. Second, to provide a machine which,when secured to an object for morticing or doweling and set in fixedrelation thereto, will bore mechanically true holes in the object bothin the instance of a. single bore or in a row of overlapping bores,therebyeliminating the slow and difficult process of chiselling out theintermediate cross sections and unaligned side sections between theholes so bored.

A still further object is to provide a mechanical aid for drilling a rowof aligned holes which will keep the holes parallel and aligned andwhich will also keep the bit from breaking off into an adjoining holeeven though the holes are overlapping or from following the grain of thewood.

These objects I accomplish with the device illustrated in theaccompanying drawing in which similar numerals and letters of referenceindicate like parts throughout the several views and as described in thespecification forming a part of. this application and pointed out in theappended claims. a

In the drawing,

Figure 1 is a front view of the device.

.Figure 2 is a side elevation of Figure 1, showing the boring deviceattached to a door or board, ready for use, the handle and part of thebit being cut away.

Figure Bis a plan view of the device as shown in Figure 2.

Figure 4 is a longitudinal section of a smaller cylinder for usingsmaller diametered bits in the device.

Figure 3.

In the drawing I have shown clamp yokes A and B spaced apart by suitablespacer bars 8 at their head end and Ill at their bifurcated ends. Thebifurcated ends of said yokesare fitted with clamp plates l on one sideheld in relation to the yokes by spaced apart thumb screws 2 and plates3 on the other side held in place bya single thumb screw 4, and guidedby pins 5 extended from the plate 3 parallel to the thumb screws.

The yokes are preferably formed. in a single casting with parallelspacers C and D spacing the sides apart forming a box-like frame work ateach end, the outside or each yoke A and B being reinforced by ribs forstrength;

A bit breast plate I is slidably mounted and carried in grooves orchannels formed on the inside of the bars 8 thus the plate I may bemoved end to end of the entire frame work made. by the two yokes andtheir spacers. As a means for controlling the position of the plate 1 Iprovide a rod [2 mounted in one end of the plate I carried through anangle bracket 13 mounted in one oi the spacers C of the yoke A. A setscrew I4 is provided in the end of the bracket I3 by. which the positionof the rod may be set and held stationary at any point. 3

On the outside face of the bit breast plate I there is a set of spacedapart half circular internally threaded jaws l6 and IT made to. engagethe threaded bit shaft as shown in Figures 2 and 3. These jaws arepivotally mounted. tothe plate 1 by pivot pins passing through eachoutside end of the jaws the pins being held by spaced apart bearingblocks l9 secured through the plate I by threaded stub shafts and. heldsecurely by lock nuts 18 on reverse side of plate 1.

two jaws l6 and 11 and engaged over a pin 24 on the jaw I! to lock thetwo jaws in engagement with the threaded shaft of the bit. The jaws areheld spaced open, when not in use, by leaf springs 21 set under the jawsand pins 22 hold the jaws from opening too far.

These springs are to quickly release thebitfor withdrawal from the borewhen the sleeve has been released from the jaws, making quicker actionin the use of the device. i

Centrally through the plate I and in axial alignment. with the axis ofthe twolock jaws, when they are engaged together, there is a threadedaperture in which the boring bit guide tube 25 is inserted. These tubesmay vary in size the largest being externally threaded to fit thethreaded aperture, and when smaller holes are being bored with thedevice, the smaller tubes will be provided with filler rings 26, saidrings being externally threaded to fit into the said aperture, andinternally threaded to fit the tube or, if desired, the tubes may beprovided with a threaded flange for this purpose. Figure 4 of thedrawing shows one of the smaller tubes. Internal collars (not shown) maybe inserted into the inside'open end of any of the larger tubes if boressmaller than diameter of the threaded bit shafts are desired.

The bit shaft HI of this device shown in Figures 2 and 3 is providedwith the usual tapered end for engaging a crank arm 28 or an. ordinarybrace and the shaft of the bit H is threaded to mesh in the jaws I6 andIT, with the inner end of the bit formed into the cutting and boring end20 A bayonet slotted sleeve 23 is passed over the H2 preferably of theusual spiral form as shown.

The operation of my device is as follows: With the exception of theapplication of the device in the instance of doors already hinged totheir respective supports, it is of no consequence in what position orat what angle the device is applied. In the case of doors already hung,however, the logical position of the device would be with the protrudingend of the bit breast adjusting rod [2 pointing upwardly.

The clamp plates I each having two adjusting screws 2 are set to apredetermined distance from, and parallel with the inside edge of theirrespective yoke flanges (distance determined by thickness of material tobe bored cojointly with center of bore), and are to remain in thatposition until the job or jobs for which they were set have beenaccomplished. The single screw 4 on opposite side is to be manipulatedfor tightening the grip or releasing for removal of the device. Thisparticular arrangement of pairs of screws on one side and single screwson the opposite side holds a twofold purpose, one for expeditiousremoval and refastening the device to the work and the other for afirmer grip on the work.

It will also be observed that besides automatically feeding the augerinto the timber the jaws l6 and I! also at the same time perform thevery important mission of insuring the bit against deviation from astraight forward course. In addition, by removing sleeve 23 the jawswill, by self action of spring 2| automatically open sumcient tofacilitate expeditious withdrawal of the bit from the bore.

The great importance of the jaws l6 and I! will be evident when the factis realized that the diametrical measurements of the commerciallymanufactured auger bits are some thousandths of an inch less at the deadend of the auger portion than at the head or cutting end. Consequently,the guide tube 25 being diametrically equal throughout it follows thatunless some preventive means such as the jaws I6 and I7 is provided, thebit will be subject to deviation in either direction'ofi its truecourse, which would render the device useless over and above the meritof the commonly used hand brace.

Being fully aware that prior to my invention diverse devices along thesame objective have been made and patented, and although fully convincedfrom a lifetime practical experience in the fieldof buildingconstruction that the automatic feeding, direct action, and theelimination of all gears constitute in themselves a valuable improvementin the art, I nevertheless, do not claim this particular combinationbroadly, but I claim the jaw mechanism as being justly and truly my ownorigination as an indispensable adjunct in the attainment ofmechanically true performance for which the machine in its entirety wasdesigned and constructed.

I do not however wish to be tied exclusively to the threading of the bitshaft and the lock jaws, should other means equally eificient beavailable and desirable for the propelling of the bit, in which case thelock jaws, minus the threads, would still serve the purpose for whichthey are intended, namely, to keep the bit from deviating.

Having thus described'my invention I desire to secure by Letters Patentand claim:

1. A device for boring aligned holes in wood with an auger bit,comprising a framework adapted to be secured to and embrace the edge ofthe wood to be bored; a breast plate longitudinally adjustable on saidframework; a pair of opposed internally threaded jaws pivotally mountedto said breast plate on each side of a central hole through said breastplate; means to lock the jaws together to guide a bit; a cylindricaltube mounted on the opposite side of said breast plate to guide the bitinto the wood; and removable means to vary the size of the bore of saidcylindrical tube.

2. In a device for boring aligned holes the combination, of a breastplate having a central guide opening therein carrying a tubular guidemember; spaced apart opposed jaws having semi-circular internallythreaded engaging portions which when engaged form a circular guide inaxial alignment with the opening in the breast plate; springs tonormally hold the jaws in open disengaged position; means to lock thejaws in engaging position; and means to attach the breast plate to thework being bored.

3. In a device for boring aligned holes the combination, of a breastplate having a central opening; spaced apart jaws having semi-circularengaging portions which when engaged form a circular guide in axialalignment with the opening in the breast plate; means to lock the jawsin engaging position;.a support for said breast plate; means to permitlongitudinal movement of the breast plate on its support; and means toattach the support to the work being bored.

OLOF NIILSON.

